Improvement in floor-clamps



UNITED STATES PATENT OFFICE.

WILLIAM B. CLARK, on SPRINGFIELD, ILLINOIS.

IMPROVEMENT FLOOR-CLAMPS.

Specification forming part of Letters Patent Nodlfi l, I 45, dated June8, 1875; application filed April 8', 1875. I

To all whom it may concern:

Be it known that I, WILLIAM D. CLARK, of Springfield, in the county ofSangamon and State of Illinois, have invented a new and ImprovedFloor-Olamp and I do hereby declare that the following is a full andexact description of the same, reference being had to the accompanyingdrawings and to the letters of reference marked thereon.

The object I have in view is the production of a light and convenientportable floor-clamp that shall combine strength and simplicity, and beeffective in result.

My invention consists in a cam, secured to the lower end of asleeve, orcast in one piece with the sleeve, said sleeve being squared on itsupper end to hold a transverse handle, which, when turned, presses thecam against, and forces forward, a presser-arm that presses intoposition the board to be fastened down, the cam being held down to thefloor or beam by a rod that passes through the sleeve, and has ascrew-head which penetrates said beam or floor; and, further, in an armthat is sleeved on its inner end to the sleeve before mentioned, and isprovided with one or more spurs on its outer end, which are driven intothe floor or beam, whenthe clamp is secured by the screw, and assists inkeeping the clamp in position; and, further, in having the presserarmforked and straddling the sleeve, the outer ends of the fork inclosing apart of the horizontal holding-arm, the under side of the resser-armbeing provided with a pin that projects downwardly, and engages in aslot cast in the top of the cam, which draws the arm back when the camis turned, and confines the play of the cam to its most efficientlimits; and, further, the horizontal holding- I arm and the presser-armare held down to the cam .by a ring on the sleeve secured in anyposition by a set-screw. By pressing the pin on the presser-arm into theslot on the .cam the presser-arm is held to the other parts, and cannotbecome disengaged without first raising the ring. The pr'esser-arm isprovided with a head that has a groove to cover the tongue on the boardto be secured, and is cut away on its upper part to allow the nail to bedriven into the side of the tongue.

To enable others skilled in the art to manufacture my device, I proceedto describe the same in connection with the drawings, in which Figure 1is a perspective view, Fig. 2 is a sectional view, and Fig. 3 a planview, of the bottom of the device. 7

Like letters denote similar parts in each figure.

A represents the cam, preferably cast in one piece with the sleeve B,and having cast on its upper face a slot, a. The sleeve B is squared onits upper end to hold a transverse handle, 0. D represents a rod, whichpasses through the sleeve B, and is provided with a screw, 12, on itslower end, which keeps it from slipping up, and a handle, E, on itsupper end, which keeps it from slipping down. F repre* sents an arm thatextends at right angles from the sleeve B, and has its inner end forkedat c to straddle saidsleeve. The outer end is'en larged to form a head,G, which is grooved at cl, with its upper part cut away to leave a slot,6, on its upper face. The middle part of the arm F is cast with ashoulder to form a bearing-face for the cam. A pin, f, projects from theunder side of the arm F forward of the fork 0, near the shoulder beforementioned, and engages in the slot at on the cam. H represents an armthat has a hole, 9, on one end, by which it is sleeved on the sleeve B.The arm H is made to fit inthe forked end of the arm F, and has itsouter end bent down at h, and is provided with one or more spurs. K is aring sleeved on the sleeve B above the arm H, and is provided with aset-screw, i, to secure it to the sleeve. It is pushed down on thesleeve B, and secured by the set-screw, thus securing the arms F and Hto the other parts of the machine.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of the cam A, the sleeve B,provided with the handleO,the rod D, provided with the handle E and the screw b, and thepresser-arm F, substantially as described. 2. The combination of the camA, the sleeve B, provided with the handle 0, the arm H, provided withthe spurh, and the presser-arm F, substantially as described.

3. The combination of the cam A,the sleeve B, provided with the handleC, the rod D, provided with the handle E and the screw 1), the arm H,provided'with the spur h, and the presscr F, substantially as described.

4. The combination of the cam A, provided with the slota in its uppersurface, the sleeve B, provided with a handle, the rod D, provided witha handle and a screw, 1), and the presser-arm F, provided with the pin fon its under side, adapted to draw back the presser-arm when the cam isturned, substantially as described and shown.

5. The combination of the cam A, the sleeve 15th day of March, 1875.

WILLIAM D. CLARK. Witnesses:

SAML. D. ScHoLEs, T. O. MATHER.

